Question

A 5.0 kg block moves in a straightline on a horizontal frictionless
surface under the influence of aforce that varies with position as
shown in Fig. 7-31. How muchwork is done by the force as the block
moves from the origin tox = 8.0 m?
J

The only force acting on a 1.9 kg body
as it moves along the x axisvaries as shown in Fig. 7-33.
The velocity of the body atx = 0 is 4.0 m/s.

Figure 7-33

(a) What is the kinetic energy of the body atx
= 3.0 m? J
(b) At what value of x will the body have a kinetic
energyof 8.0 J?m
(c) What is the maximum kinetic energy attained by the body
betweenx = 0 and x = 5.0 m?J